How to fix SAP error B1527?

What causes this issue? To call a BAPI the IDoc data must first be assigned to the relevant BAPI interface parameters. An error has occured when carrying out this operation, possibly due to an incorrect data type or data format in the segment &v1&.System Response The system issues an error message and will not allow you to continue with this transaction until the error is resolved. How to fix this error? Check that the data types in the IDoc data record matches the data types in the BAPI parameter.Error message extract from SAP system. Copyright SAP SE.

How To Fix B1527 - An error has occurred assigning data (&)

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B1527 - Overview

Message type: E = Error
Message class: B1 - ALE group messages
Message number: 527
Message text: An error has occurred assigning data (&)
Show details Hide details
What causes this issue?
To call a BAPI the IDoc data must first be assigned to the relevant
BAPI interface parameters.
An error has occured when carrying out this operation, possibly due to
an incorrect data type or data format in the segment &v1&.
System Response
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
How to fix this error?
Check that the data types in the IDoc data record matches the data
types in the BAPI parameter.

Error message extract from SAP system. Copyright SAP SE.

B1527 - Details

Error Code: B1527
Error Message: An error has occurred assigning data (&)

Summary
This error indicates that the system encountered a problem while trying to assign or map data during a process, often due to missing or incorrect data references or configuration inconsistencies.

Root Causes
Missing or incorrect master data entries that the system expects to assign (e.g., missing cost center, profit center, or material master data).
Configuration issues where assignment rules or mapping tables are incomplete or incorrect.
User input errors where mandatory fields are left blank or contain invalid values.
Integration problems between modules where data transfer or assignment logic fails.
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